Karika 36

ētē pradīpakalpāḥ parasparavilakṣaṇā guṇaviśēṣāḥ। kr̥tsnaṁ puruṣasyārthaṁ prakāśya buddhau prayacchanti ॥36॥

These (instruments) having various special and opposing qualities tries to illuminate the intellect, like a lamp, for the sake of the purusha.